It shall be the duty of the poundmaster to keep all dogs so impounded for a period of three days. If at the expiration of three days from the date of notice to the owner, or if the owner is unknown, at the expiration of three days from the date such dog is first impounded, if such dog shall not have been redeemed, it may be destroyed. Any unlicensed dog required by law to be licensed, or any dog which appears to be suffering from rabies or affected with hydrophobia, mange, or other infectious or dangerous disease shall not be released but may be forthwith destroyed.
(‘82 Code, § 5-603)